[tfaber] 66189: [RTL] - Implement RtlIpv4StringToAddressW. Dedicated to Jérôme. Thanks to the countless reviewers. CORE-6490

Author: tfaber
Date: Sat Feb  7 13:24:29 2015
New Revision: 66189

URL: http://svn.reactos.org/svn/reactos?rev=66189&view=rev
Log:
[RTL]
- Implement RtlIpv4StringToAddressW. Dedicated to Jérôme. Thanks to the countless reviewers.
CORE-6490

Modified:
    trunk/reactos/lib/rtl/network.c
    trunk/reactos/lib/rtl/rtl.h

Modified: trunk/reactos/lib/rtl/network.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/lib/rtl/network.c?rev=66189...
==============================================================================
--- trunk/reactos/lib/rtl/network.c	[iso-8859-1] (original)
+++ trunk/reactos/lib/rtl/network.c	[iso-8859-1] Sat Feb  7 13:24:29 2015
@@ -3,6 +3,7 @@
  * PROJECT:           ReactOS Runtime Library
  * PURPOSE:           Network Address Translation implementation
  * PROGRAMMER:        Alex Ionescu ([e-mail])
+ *                    Thomas Faber ([e-mail])
  */

/* INCLUDES *****************************************************************/
@@ -21,7 +22,82 @@
 /* network to host order conversion for little endian machines */
 #define WN2H(w) (((w & 0xFF00) >> 8) | ((w & 0x00FF) << 8))

-/* FUNCTIONS ***************************************************************/
+/* PRIVATE FUNCTIONS **********************************************************/
+
+static
+NTSTATUS
+RtlpStringToUlong(
+    _In_ PCWSTR String,
+    _In_ BOOLEAN Strict,
+    _Out_ PCWSTR *Terminator,
+    _Out_ PULONG Out)
+{
+    /* If we never see any digits, we'll return this */
+    NTSTATUS Status = STATUS_INVALID_PARAMETER;
+    ULONG Result = 0;
+    ULONG Base = 10;
+    ULONG Digit;
+
+    if (String[0] == L'0')
+    {
+        if (String[1] == L'x' || String[1] == L'X')
+        {
+            /* 0x/0X prefix -- hex */
+            String += 2;
+            Base = 16;
+        }
+        else if (String[1] >= L'0' && String[1] <= L'9')
+        {
+            /* 0 prefix -- octal */
+            String++;
+            Base = 8;
+        }
+    }
+
+    /* Strict forbids anything but decimal */
+    if (Strict && Base != 10)
+    {
+        Status = STATUS_INVALID_PARAMETER;
+        goto Done;
+    }
+
+    while (1)
+    {
+        if (*String >= L'0' && *String <= L'7')
+            Digit = *String - L'0';
+        else if (*String >= L'0' && *String <= L'9' && Base >= 10)
+            Digit = *String - L'0';
+        else if (*String >= L'A' && *String <= L'F' && Base >= 16)
+            Digit = 10 + (*String - L'A');
+        else if (*String >= L'a' && *String <= L'f' && Base >= 16)
+            Digit = 10 + (*String - L'a');
+        else
+            break;
+
+        Status = RtlULongMult(Result, Base, &Result);
+        if (!NT_SUCCESS(Status))
+        {
+            Status = STATUS_INVALID_PARAMETER;
+            break;
+        }
+
+        Status = RtlULongAdd(Result, Digit, &Result);
+        if (!NT_SUCCESS(Status))
+        {
+            Status = STATUS_INVALID_PARAMETER;
+            break;
+        }
+
+        String++;
+    }
+
+Done:
+    *Terminator = String;
+    *Out = Result;
+    return Status;
+}
+
+/* PUBLIC FUNCTIONS ***********************************************************/

/*
  * @implemented
@@ -198,17 +274,66 @@
 }

/*
-* @unimplemented
-*/
-NTSTATUS
-NTAPI
-RtlIpv4StringToAddressW(IN PCWSTR String,
-                        IN BOOLEAN Strict,
-                        OUT PCWSTR *Terminator,
-                        OUT struct in_addr *Addr)
-{
-    UNIMPLEMENTED;
-    return STATUS_NOT_IMPLEMENTED;
+ * @implemented
+ */
+NTSTATUS
+NTAPI
+RtlIpv4StringToAddressW(
+    _In_ PCWSTR String,
+    _In_ BOOLEAN Strict,
+    _Out_ PCWSTR *Terminator,
+    _Out_ struct in_addr *Addr)
+{
+    NTSTATUS Status;
+    ULONG Values[4];
+    ULONG Result;
+    INT Parts = 0;
+    INT i;
+
+    do
+    {
+        Status = RtlpStringToUlong(String, Strict, &String, &Values[Parts]);
+        Parts++;
+
+        if (*String != L'.')
+            break;
+
+        /* Already four parts, but a dot follows? */
+        if (Parts == 4)
+        {
+            Status = STATUS_INVALID_PARAMETER;
+            goto Done;
+        }
+
+        /* Skip the dot */
+        String++;
+    } while (NT_SUCCESS(Status));
+
+    if (Strict && Parts < 4)
+        Status = STATUS_INVALID_PARAMETER;
+
+    if (!NT_SUCCESS(Status))
+        goto Done;
+
+    /* Combine the parts */
+    Result = Values[Parts - 1];
+    for (i = 0; i < Parts - 1; i++)
+    {
+        INT Shift = CHAR_BIT * (3 - i);
+
+        if (Values[i] > 0xFF || (Result & (0xFF << Shift)) != 0)
+        {
+            Status = STATUS_INVALID_PARAMETER;
+            goto Done;
+        }
+        Result |= Values[i] << Shift;
+    }
+
+    Addr->S_un.S_addr = RtlUlongByteSwap(Result);
+
+Done:
+    *Terminator = String;
+    return Status;
 }

/*

Modified: trunk/reactos/lib/rtl/rtl.h
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/lib/rtl/rtl.h?rev=66189&...
==============================================================================
--- trunk/reactos/lib/rtl/rtl.h	[iso-8859-1] (original)
+++ trunk/reactos/lib/rtl/rtl.h	[iso-8859-1] Sat Feb  7 13:24:29 2015
@@ -27,6 +27,7 @@
 #include <winbase.h>
 #include <winreg.h>
 #include <objbase.h>
+#include <ntintsafe.h>
 #include <ndk/exfuncs.h>
 #include <ndk/iofuncs.h>
 #include <ndk/kefuncs.h>